We need to know who has previously signed up. This is accomplished by saving the old volunteer list CSV files. This function opens the one and only volunteer list CSV file in the specified directory. If there is more than one file in the directory, execution will stop.
The directory in which _one_ volunteer list is stored.
The prefix of the volunteer list CSV file. The file
A data frame of volunteer information read from the file, or NULL if a file cannot be located.
data0 <- getPreviousVolunteerList(volunteerListDirectory, volunteerListFilePrefix)
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